gcc/ipa-prop.h

   1 /* Interprocedural analyses.
   2    Copyright (C) 2005-2014 Free Software Foundation, Inc.
   3
   4 This file is part of GCC.
   5
   6 GCC is free software; you can redistribute it and/or modify it under
   7 the terms of the GNU General Public License as published by the Free
   8 Software Foundation; either version 3, or (at your option) any later
   9 version.
  10
  11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14 for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GCC; see the file COPYING3.  If not see
  18 <http://www.gnu.org/licenses/>.  */
  19
  20 #ifndef IPA_PROP_H
  21 #define IPA_PROP_H
  22
  23
  24 /* The following definitions and interfaces are used by
  25    interprocedural analyses or parameters.  */
  26
  27 #define IPA_UNDESCRIBED_USE -1
  28
  29 /* ipa-prop.c stuff (ipa-cp, indirect inlining):  */
  30
  31 /* A jump function for a callsite represents the values passed as actual
  32    arguments of the callsite.  They were originally proposed in a paper called
  33    "Interprocedural Constant Propagation", by David Callahan, Keith D Cooper,
  34    Ken Kennedy, Linda Torczon in Comp86, pg 152-161.  There are three main
  35    types of values :
  36
  37    Pass-through - the caller's formal parameter is passed as an actual
  38                   argument, possibly one simple operation performed on it.
  39    Constant     - a constant (is_gimple_ip_invariant)is passed as an actual
  40                   argument.
  41    Unknown      - neither of the above.
  42
  43    IPA_JF_ANCESTOR is a special pass-through jump function, which means that
  44    the result is an address of a part of the object pointed to by the formal
  45    parameter to which the function refers.  It is mainly intended to represent
  46    getting addresses of of ancestor fields in C++
  47    (e.g. &this_1(D)->D.1766.D.1756).  Note that if the original pointer is
  48    NULL, ancestor jump function must behave like a simple pass-through.
  49
  50    Other pass-through functions can either simply pass on an unchanged formal
  51    parameter or can apply one simple binary operation to it (such jump
  52    functions are called polynomial).
  53
  54    IPA_JF_KNOWN_TYPE is a special type of an "unknown" function that applies
  55    only to pointer parameters.  It means that even though we cannot prove that
  56    the passed value is an interprocedural constant, we still know the exact
  57    type of the containing object which may be valuable for devirtualization.
  58
  59    Jump functions are computed in ipa-prop.c by function
  60    update_call_notes_after_inlining.  Some information can be lost and jump
  61    functions degraded accordingly when inlining, see
  62    update_call_notes_after_inlining in the same file.  */
  63
  64 enum jump_func_type
  65 {
  66   IPA_JF_UNKNOWN = 0,  /* newly allocated and zeroed jump functions default */
  67   IPA_JF_KNOWN_TYPE,        /* represented by field known_type */
  68   IPA_JF_CONST,             /* represented by field costant */
  69   IPA_JF_PASS_THROUGH,      /* represented by field pass_through */
  70   IPA_JF_ANCESTOR           /* represented by field ancestor */
  71 };
  72
  73 /* Structure holding data required to describe a known type jump function.  */
  74 struct GTY(()) ipa_known_type_data
  75 {
  76   /* Offset of the component of the base_type being described.  */
  77   HOST_WIDE_INT offset;
  78   /* Type of the whole object.  */
  79   tree base_type;
  80   /* Type of the component of the object that is being described.  */
  81   tree component_type;
  82 };
  83
  84 struct ipa_cst_ref_desc;
  85
  86 /* Structure holding data required to describe a constant jump function.  */
  87 struct GTY(()) ipa_constant_data
  88 {
  89   /* THe value of the constant.  */
  90   tree value;
  91   /* Pointer to the structure that describes the reference.  */
  92   struct ipa_cst_ref_desc GTY((skip)) *rdesc;
  93 };
  94
  95 /* Structure holding data required to describe a pass-through jump function.  */
  96
  97 struct GTY(()) ipa_pass_through_data
  98 {
  99   /* If an operation is to be performed on the original parameter, this is the
 100      second (constant) operand.  */
 101   tree operand;
 102   /* Number of the caller's formal parameter being passed.  */
 103   int formal_id;
 104   /* Operation that is performed on the argument before it is passed on.
 105      NOP_EXPR means no operation.  Otherwise oper must be a simple binary
 106      arithmetic operation where the caller's parameter is the first operand and
 107      operand field from this structure is the second one.  */
 108   enum tree_code operation;
 109   /* When the passed value is a pointer, it is set to true only when we are
 110      certain that no write to the object it points to has occurred since the
 111      caller functions started execution, except for changes noted in the
 112      aggregate part of the jump function (see description of
 113      ipa_agg_jump_function).  The flag is used only when the operation is
 114      NOP_EXPR.  */
 115   unsigned agg_preserved : 1;
 116
 117   /* When set to true, we guarantee that, if there is a C++ object pointed to
 118      by this object, it does not undergo dynamic type change in the course of
 119      functions decribed by this jump function.  */
 120   unsigned type_preserved : 1;
 121 };
 122
 123 /* Structure holding data required to describe an ancestor pass-through
 124    jump function.  */
 125
 126 struct GTY(()) ipa_ancestor_jf_data
 127 {
 128   /* Offset of the field representing the ancestor.  */
 129   HOST_WIDE_INT offset;
 130   /* Type of the result.
 131      When TYPE_PRESERVED is false, TYPE is NULL, since it is only
 132      relevant for the devirtualization machinery.  */
 133   tree type;
 134   /* Number of the caller's formal parameter being passed.  */
 135   int formal_id;
 136   /* Flag with the same meaning like agg_preserve in ipa_pass_through_data.  */
 137   unsigned agg_preserved : 1;
 138   /* When set to true, we guarantee that, if there is a C++ object pointed to
 139      by this object, it does not undergo dynamic type change in the course of
 140      functions decribed by this jump function.  */
 141   unsigned type_preserved : 1;
 142 };
 143
 144 /* An element in an aggegate part of a jump function describing a known value
 145    at a given offset.  When it is part of a pass-through jump function with
 146    agg_preserved set or an ancestor jump function with agg_preserved set, all
 147    unlisted positions are assumed to be preserved but the value can be a type
 148    node, which means that the particular piece (starting at offset and having
 149    the size of the type) is clobbered with an unknown value.  When
 150    agg_preserved is false or the type of the containing jump function is
 151    different, all unlisted parts are assumed to be unknown and all values must
 152    fulfill is_gimple_ip_invariant.  */
 153
 154 struct GTY(()) ipa_agg_jf_item
 155 {
 156   /* The offset at which the known value is located within the aggregate.  */
 157   HOST_WIDE_INT offset;
 158
 159   /* The known constant or type if this is a clobber.  */
 160   tree value;
 161 };
 162
 163
 164 /* Aggregate jump function - i.e. description of contents of aggregates passed
 165    either by reference or value.  */
 166
 167 struct GTY(()) ipa_agg_jump_function
 168 {
 169   /* Description of the individual items.  */
 170   vec<ipa_agg_jf_item, va_gc> *items;
 171   /* True if the data was passed by reference (as opposed to by value). */
 172   bool by_ref;
 173 };
 174
 175 typedef struct ipa_agg_jump_function *ipa_agg_jump_function_p;
 176
 177 /* A jump function for a callsite represents the values passed as actual
 178    arguments of the callsite. See enum jump_func_type for the various
 179    types of jump functions supported.  */
 180 struct GTY (()) ipa_jump_func
 181 {
 182   /* Aggregate contants description.  See struct ipa_agg_jump_function and its
 183      description.  */
 184   struct ipa_agg_jump_function agg;
 185
 186   enum jump_func_type type;
 187   /* Represents a value of a jump function.  pass_through is used only in jump
 188      function context.  constant represents the actual constant in constant jump
 189      functions and member_cst holds constant c++ member functions.  */
 190   union jump_func_value
 191   {
 192     struct ipa_known_type_data GTY ((tag ("IPA_JF_KNOWN_TYPE"))) known_type;
 193     struct ipa_constant_data GTY ((tag ("IPA_JF_CONST"))) constant;
 194     struct ipa_pass_through_data GTY ((tag ("IPA_JF_PASS_THROUGH"))) pass_through;
 195     struct ipa_ancestor_jf_data GTY ((tag ("IPA_JF_ANCESTOR"))) ancestor;
 196   } GTY ((desc ("%1.type"))) value;
 197 };
 198
 199
 200 /* Return the offset of the component that is described by a known type jump
 201    function JFUNC.  */
 202
 203 static inline HOST_WIDE_INT
 204 ipa_get_jf_known_type_offset (struct ipa_jump_func *jfunc)
 205 {
 206   gcc_checking_assert (jfunc->type == IPA_JF_KNOWN_TYPE);
 207   return jfunc->value.known_type.offset;
 208 }
 209
 210 /* Return the base type of a known type jump function JFUNC.  */
 211
 212 static inline tree
 213 ipa_get_jf_known_type_base_type (struct ipa_jump_func *jfunc)
 214 {
 215   gcc_checking_assert (jfunc->type == IPA_JF_KNOWN_TYPE);
 216   return jfunc->value.known_type.base_type;
 217 }
 218
 219 /* Return the component type of a known type jump function JFUNC.  */
 220
 221 static inline tree
 222 ipa_get_jf_known_type_component_type (struct ipa_jump_func *jfunc)
 223 {
 224   gcc_checking_assert (jfunc->type == IPA_JF_KNOWN_TYPE);
 225   return jfunc->value.known_type.component_type;
 226 }
 227
 228 /* Return the constant stored in a constant jump functin JFUNC.  */
 229
 230 static inline tree
 231 ipa_get_jf_constant (struct ipa_jump_func *jfunc)
 232 {
 233   gcc_checking_assert (jfunc->type == IPA_JF_CONST);
 234   return jfunc->value.constant.value;
 235 }
 236
 237 static inline struct ipa_cst_ref_desc *
 238 ipa_get_jf_constant_rdesc (struct ipa_jump_func *jfunc)
 239 {
 240   gcc_checking_assert (jfunc->type == IPA_JF_CONST);
 241   return jfunc->value.constant.rdesc;
 242 }
 243
 244 /* Return the operand of a pass through jmp function JFUNC.  */
 245
 246 static inline tree
 247 ipa_get_jf_pass_through_operand (struct ipa_jump_func *jfunc)
 248 {
 249   gcc_checking_assert (jfunc->type == IPA_JF_PASS_THROUGH);
 250   return jfunc->value.pass_through.operand;
 251 }
 252
 253 /* Return the number of the caller's formal parameter that a pass through jump
 254    function JFUNC refers to.  */
 255
 256 static inline int
 257 ipa_get_jf_pass_through_formal_id (struct ipa_jump_func *jfunc)
 258 {
 259   gcc_checking_assert (jfunc->type == IPA_JF_PASS_THROUGH);
 260   return jfunc->value.pass_through.formal_id;
 261 }
 262
 263 /* Return operation of a pass through jump function JFUNC.  */
 264
 265 static inline enum tree_code
 266 ipa_get_jf_pass_through_operation (struct ipa_jump_func *jfunc)
 267 {
 268   gcc_checking_assert (jfunc->type == IPA_JF_PASS_THROUGH);
 269   return jfunc->value.pass_through.operation;
 270 }
 271
 272 /* Return the agg_preserved flag of a pass through jump function JFUNC.  */
 273
 274 static inline bool
 275 ipa_get_jf_pass_through_agg_preserved (struct ipa_jump_func *jfunc)
 276 {
 277   gcc_checking_assert (jfunc->type == IPA_JF_PASS_THROUGH);
 278   return jfunc->value.pass_through.agg_preserved;
 279 }
 280
 281 /* Return the type_preserved flag of a pass through jump function JFUNC.  */
 282
 283 static inline bool
 284 ipa_get_jf_pass_through_type_preserved (struct ipa_jump_func *jfunc)
 285 {
 286   gcc_checking_assert (jfunc->type == IPA_JF_PASS_THROUGH);
 287   return jfunc->value.pass_through.type_preserved;
 288 }
 289
 290 /* Return the offset of an ancestor jump function JFUNC.  */
 291
 292 static inline HOST_WIDE_INT
 293 ipa_get_jf_ancestor_offset (struct ipa_jump_func *jfunc)
 294 {
 295   gcc_checking_assert (jfunc->type == IPA_JF_ANCESTOR);
 296   return jfunc->value.ancestor.offset;
 297 }
 298
 299 /* Return the result type of an ancestor jump function JFUNC.  */
 300
 301 static inline tree
 302 ipa_get_jf_ancestor_type (struct ipa_jump_func *jfunc)
 303 {
 304   gcc_checking_assert (jfunc->type == IPA_JF_ANCESTOR);
 305   return jfunc->value.ancestor.type;
 306 }
 307
 308 /* Return the number of the caller's formal parameter that an ancestor jump
 309    function JFUNC refers to.  */
 310
 311 static inline int
 312 ipa_get_jf_ancestor_formal_id (struct ipa_jump_func *jfunc)
 313 {
 314   gcc_checking_assert (jfunc->type == IPA_JF_ANCESTOR);
 315   return jfunc->value.ancestor.formal_id;
 316 }
 317
 318 /* Return the agg_preserved flag of an ancestor jump function JFUNC.  */
 319
 320 static inline bool
 321 ipa_get_jf_ancestor_agg_preserved (struct ipa_jump_func *jfunc)
 322 {
 323   gcc_checking_assert (jfunc->type == IPA_JF_ANCESTOR);
 324   return jfunc->value.ancestor.agg_preserved;
 325 }
 326
 327 /* Return the type_preserved flag of an ancestor jump function JFUNC.  */
 328
 329 static inline bool
 330 ipa_get_jf_ancestor_type_preserved (struct ipa_jump_func *jfunc)
 331 {
 332   gcc_checking_assert (jfunc->type == IPA_JF_ANCESTOR);
 333   return jfunc->value.ancestor.type_preserved;
 334 }
 335
 336 /* Summary describing a single formal parameter.  */
 337
 338 struct ipa_param_descriptor
 339 {
 340   /* PARAM_DECL of this parameter.  */
 341   tree decl;
 342   /* If all uses of the parameter are described by ipa-prop structures, this
 343      says how many there are.  If any use could not be described by means of
 344      ipa-prop structures, this is IPA_UNDESCRIBED_USE.  */
 345   int controlled_uses;
 346   unsigned int move_cost : 31;
 347   /* The parameter is used.  */
 348   unsigned used : 1;
 349 };
 350
 351 struct ipcp_lattice;
 352
 353 /* ipa_node_params stores information related to formal parameters of functions
 354    and some other information for interprocedural passes that operate on
 355    parameters (such as ipa-cp).  */
 356
 357 struct ipa_node_params
 358 {
 359   /* Information about individual formal parameters that are gathered when
 360      summaries are generated. */
 361   vec<ipa_param_descriptor> descriptors;
 362   /* Pointer to an array of structures describing individual formal
 363      parameters.  */
 364   struct ipcp_param_lattices *lattices;
 365   /* Only for versioned nodes this field would not be NULL,
 366      it points to the node that IPA cp cloned from.  */
 367   struct cgraph_node *ipcp_orig_node;
 368   /* If this node is an ipa-cp clone, these are the known values that describe
 369      what it has been specialized for.  */
 370   vec<tree> known_vals;
 371   /* Whether the param uses analysis and jump function computation has already
 372      been performed.  */
 373   unsigned analysis_done : 1;
 374   /* Whether the function is enqueued in ipa-cp propagation stack.  */
 375   unsigned node_enqueued : 1;
 376   /* Whether we should create a specialized version based on values that are
 377      known to be constant in all contexts.  */
 378   unsigned do_clone_for_all_contexts : 1;
 379   /* Set if this is an IPA-CP clone for all contexts.  */
 380   unsigned is_all_contexts_clone : 1;
 381   /* Node has been completely replaced by clones and will be removed after
 382      ipa-cp is finished.  */
 383   unsigned node_dead : 1;
 384 };
 385
 386 /* ipa_node_params access functions.  Please use these to access fields that
 387    are or will be shared among various passes.  */
 388
 389 /* Return the number of formal parameters. */
 390
 391 static inline int
 392 ipa_get_param_count (struct ipa_node_params *info)
 393 {
 394   return info->descriptors.length ();
 395 }
 396
 397 /* Return the declaration of Ith formal parameter of the function corresponding
 398    to INFO.  Note there is no setter function as this array is built just once
 399    using ipa_initialize_node_params. */
 400
 401 static inline tree
 402 ipa_get_param (struct ipa_node_params *info, int i)
 403 {
 404   gcc_checking_assert (!flag_wpa);
 405   return info->descriptors[i].decl;
 406 }
 407
 408 /* Return the move cost of Ith formal parameter of the function corresponding
 409    to INFO.  */
 410
 411 static inline int
 412 ipa_get_param_move_cost (struct ipa_node_params *info, int i)
 413 {
 414   return info->descriptors[i].move_cost;
 415 }
 416
 417 /* Set the used flag corresponding to the Ith formal parameter of the function
 418    associated with INFO to VAL.  */
 419
 420 static inline void
 421 ipa_set_param_used (struct ipa_node_params *info, int i, bool val)
 422 {
 423   info->descriptors[i].used = val;
 424 }
 425
 426 /* Return how many uses described by ipa-prop a parameter has or
 427    IPA_UNDESCRIBED_USE if there is a use that is not described by these
 428    structures.  */
 429 static inline int
 430 ipa_get_controlled_uses (struct ipa_node_params *info, int i)
 431 {
 432   /* FIXME: introducing speuclation causes out of bounds access here.  */
 433   if (info->descriptors.length () > (unsigned)i)
 434     return info->descriptors[i].controlled_uses;
 435   return IPA_UNDESCRIBED_USE;
 436 }
 437
 438 /* Set the controlled counter of a given parameter.  */
 439
 440 static inline void
 441 ipa_set_controlled_uses (struct ipa_node_params *info, int i, int val)
 442 {
 443   info->descriptors[i].controlled_uses = val;
 444 }
 445
 446 /* Return the used flag corresponding to the Ith formal parameter of the
 447    function associated with INFO.  */
 448
 449 static inline bool
 450 ipa_is_param_used (struct ipa_node_params *info, int i)
 451 {
 452   return info->descriptors[i].used;
 453 }
 454
 455 /* Information about replacements done in aggregates for a given node (each
 456    node has its linked list).  */
 457 struct GTY(()) ipa_agg_replacement_value
 458 {
 459   /* Next item in the linked list.  */
 460   struct ipa_agg_replacement_value *next;
 461   /* Offset within the aggregate.  */
 462   HOST_WIDE_INT offset;
 463   /* The constant value.  */
 464   tree value;
 465   /* The paramter index.  */
 466   int index;
 467   /* Whether the value was passed by reference.  */
 468   bool by_ref;
 469 };
 470
 471 typedef struct ipa_agg_replacement_value *ipa_agg_replacement_value_p;
 472
 473 void ipa_set_node_agg_value_chain (struct cgraph_node *node,
 474                                    struct ipa_agg_replacement_value *aggvals);
 475
 476 /* ipa_edge_args stores information related to a callsite and particularly its
 477    arguments.  It can be accessed by the IPA_EDGE_REF macro.  */
 478 struct GTY(()) ipa_edge_args
 479 {
 480   /* Vector of the callsite's jump function of each parameter.  */
 481   vec<ipa_jump_func, va_gc> *jump_functions;
 482   vec<ipa_polymorphic_call_context, va_gc> *polymorphic_call_contexts;
 483 };
 484
 485 /* ipa_edge_args access functions.  Please use these to access fields that
 486    are or will be shared among various passes.  */
 487
 488 /* Return the number of actual arguments. */
 489
 490 static inline int
 491 ipa_get_cs_argument_count (struct ipa_edge_args *args)
 492 {
 493   return vec_safe_length (args->jump_functions);
 494 }
 495
 496 /* Returns a pointer to the jump function for the ith argument.  Please note
 497    there is no setter function as jump functions are all set up in
 498    ipa_compute_jump_functions. */
 499
 500 static inline struct ipa_jump_func *
 501 ipa_get_ith_jump_func (struct ipa_edge_args *args, int i)
 502 {
 503   return &(*args->jump_functions)[i];
 504 }
 505
 506 /* Returns a pointer to the polymorphic call context for the ith argument.
 507    NULL if contexts are not computed.  */
 508 static inline struct ipa_polymorphic_call_context *
 509 ipa_get_ith_polymorhic_call_context (struct ipa_edge_args *args, int i)
 510 {
 511   if (!args->polymorphic_call_contexts)
 512     return NULL;
 513   return &(*args->polymorphic_call_contexts)[i];
 514 }
 515
 516 /* Types of vectors holding the infos.  */
 517
 518 /* Vector where the parameter infos are actually stored. */
 519 extern vec<ipa_node_params> ipa_node_params_vector;
 520 /* Vector of known aggregate values in cloned nodes.  */
 521 extern GTY(()) vec<ipa_agg_replacement_value_p, va_gc> *ipa_node_agg_replacements;
 522 /* Vector where the parameter infos are actually stored. */
 523 extern GTY(()) vec<ipa_edge_args, va_gc> *ipa_edge_args_vector;
 524
 525 /* Return the associated parameter/argument info corresponding to the given
 526    node/edge.  */
 527 #define IPA_NODE_REF(NODE) (&ipa_node_params_vector[(NODE)->uid])
 528 #define IPA_EDGE_REF(EDGE) (&(*ipa_edge_args_vector)[(EDGE)->uid])
 529 /* This macro checks validity of index returned by
 530    ipa_get_param_decl_index function.  */
 531 #define IS_VALID_JUMP_FUNC_INDEX(I) ((I) != -1)
 532
 533 /* Creating and freeing ipa_node_params and ipa_edge_args.  */
 534 void ipa_create_all_node_params (void);
 535 void ipa_create_all_edge_args (void);
 536 void ipa_free_edge_args_substructures (struct ipa_edge_args *);
 537 void ipa_free_node_params_substructures (struct ipa_node_params *);
 538 void ipa_free_all_node_params (void);
 539 void ipa_free_all_edge_args (void);
 540 void ipa_free_all_structures_after_ipa_cp (void);
 541 void ipa_free_all_structures_after_iinln (void);
 542 void ipa_register_cgraph_hooks (void);
 543 int count_formal_params (tree fndecl);
 544
 545 /* This function ensures the array of node param infos is big enough to
 546    accommodate a structure for all nodes and reallocates it if not.  */
 547
 548 static inline void
 549 ipa_check_create_node_params (void)
 550 {
 551   if (!ipa_node_params_vector.exists ())
 552     ipa_node_params_vector.create (symtab->cgraph_max_uid);
 553
 554   if (ipa_node_params_vector.length () <= (unsigned) symtab->cgraph_max_uid)
 555     ipa_node_params_vector.safe_grow_cleared (symtab->cgraph_max_uid + 1);
 556 }
 557
 558 /* This function ensures the array of edge arguments infos is big enough to
 559    accommodate a structure for all edges and reallocates it if not.  */
 560
 561 static inline void
 562 ipa_check_create_edge_args (void)
 563 {
 564   if (vec_safe_length (ipa_edge_args_vector)
 565       <= (unsigned) symtab->edges_max_uid)
 566     vec_safe_grow_cleared (ipa_edge_args_vector, symtab->edges_max_uid + 1);
 567 }
 568
 569 /* Returns true if the array of edge infos is large enough to accommodate an
 570    info for EDGE.  The main purpose of this function is that debug dumping
 571    function can check info availability without causing reallocations.  */
 572
 573 static inline bool
 574 ipa_edge_args_info_available_for_edge_p (struct cgraph_edge *edge)
 575 {
 576   return ((unsigned) edge->uid < vec_safe_length (ipa_edge_args_vector));
 577 }
 578
 579 /* Return the aggregate replacements for NODE, if there are any.  */
 580
 581 static inline struct ipa_agg_replacement_value *
 582 ipa_get_agg_replacements_for_node (struct cgraph_node *node)
 583 {
 584   if ((unsigned) node->uid >= vec_safe_length (ipa_node_agg_replacements))
 585     return NULL;
 586   return (*ipa_node_agg_replacements)[node->uid];
 587 }
 588
 589 /* Function formal parameters related computations.  */
 590 void ipa_initialize_node_params (struct cgraph_node *node);
 591 bool ipa_propagate_indirect_call_infos (struct cgraph_edge *cs,
 592                                         vec<cgraph_edge *> *new_edges);
 593
 594 /* Indirect edge and binfo processing.  */
 595 tree ipa_get_indirect_edge_target (struct cgraph_edge *ie,
 596                                    vec<tree> ,
 597                                    vec<tree> ,
 598                                    vec<ipa_agg_jump_function_p> );
 599 struct cgraph_edge *ipa_make_edge_direct_to_target (struct cgraph_edge *, tree,
 600                                                     bool speculative = false);
 601 tree ipa_binfo_from_known_type_jfunc (struct ipa_jump_func *);
 602 tree ipa_impossible_devirt_target (struct cgraph_edge *, tree);
 603
 604 /* Functions related to both.  */
 605 void ipa_analyze_node (struct cgraph_node *);
 606
 607 /* Aggregate jump function related functions.  */
 608 tree ipa_find_agg_cst_for_param (struct ipa_agg_jump_function *, HOST_WIDE_INT,
 609                                  bool);
 610 bool ipa_load_from_parm_agg (struct ipa_node_params *, gimple, tree, int *,
 611                              HOST_WIDE_INT *, bool *);
 612
 613 /* Debugging interface.  */
 614 void ipa_print_node_params (FILE *, struct cgraph_node *node);
 615 void ipa_print_all_params (FILE *);
 616 void ipa_print_node_jump_functions (FILE *f, struct cgraph_node *node);
 617 void ipa_print_all_jump_functions (FILE * f);
 618 void ipcp_verify_propagated_values (void);
 619
 620 extern alloc_pool ipcp_values_pool;
 621 extern alloc_pool ipcp_sources_pool;
 622 extern alloc_pool ipcp_agg_lattice_pool;
 623
 624 /* Operation to be performed for the parameter in ipa_parm_adjustment
 625    below.  */
 626 enum ipa_parm_op {
 627   IPA_PARM_OP_NONE,
 628
 629   /* This describes a brand new parameter.
 630
 631      The field `type' should be set to the new type, `arg_prefix'
 632      should be set to the string prefix for the new DECL_NAME, and
 633      `new_decl' will ultimately hold the newly created argument.  */
 634   IPA_PARM_OP_NEW,
 635
 636   /* This new parameter is an unmodified parameter at index base_index. */
 637   IPA_PARM_OP_COPY,
 638
 639   /* This adjustment describes a parameter that is about to be removed
 640      completely.  Most users will probably need to book keep those so that they
 641      don't leave behinfd any non default def ssa names belonging to them.  */
 642   IPA_PARM_OP_REMOVE
 643 };
 644
 645 /* Structure to describe transformations of formal parameters and actual
 646    arguments.  Each instance describes one new parameter and they are meant to
 647    be stored in a vector.  Additionally, most users will probably want to store
 648    adjustments about parameters that are being removed altogether so that SSA
 649    names belonging to them can be replaced by SSA names of an artificial
 650    variable.  */
 651 struct ipa_parm_adjustment
 652 {
 653   /* The original PARM_DECL itself, helpful for processing of the body of the
 654      function itself.  Intended for traversing function bodies.
 655      ipa_modify_formal_parameters, ipa_modify_call_arguments and
 656      ipa_combine_adjustments ignore this and use base_index.
 657      ipa_modify_formal_parameters actually sets this.  */
 658   tree base;
 659
 660   /* Type of the new parameter.  However, if by_ref is true, the real type will
 661      be a pointer to this type.  */
 662   tree type;
 663
 664   /* Alias refrerence type to be used in MEM_REFs when adjusting caller
 665      arguments.  */
 666   tree alias_ptr_type;
 667
 668   /* The new declaration when creating/replacing a parameter.  Created
 669      by ipa_modify_formal_parameters, useful for functions modifying
 670      the body accordingly.  For brand new arguments, this is the newly
 671      created argument.  */
 672   tree new_decl;
 673
 674   /* New declaration of a substitute variable that we may use to replace all
 675      non-default-def ssa names when a parm decl is going away.  */
 676   tree new_ssa_base;
 677
 678   /* If non-NULL and the original parameter is to be removed (copy_param below
 679      is NULL), this is going to be its nonlocalized vars value.  */
 680   tree nonlocal_value;
 681
 682   /* This holds the prefix to be used for the new DECL_NAME.  */
 683   const char *arg_prefix;
 684
 685   /* Offset into the original parameter (for the cases when the new parameter
 686      is a component of an original one).  */
 687   HOST_WIDE_INT offset;
 688
 689   /* Zero based index of the original parameter this one is based on.  */
 690   int base_index;
 691
 692   /* Whether this parameter is a new parameter, a copy of an old one,
 693      or one about to be removed.  */
 694   enum ipa_parm_op op;
 695
 696   /* Storage order of the original parameter (for the cases when the new
 697      parameter is a component of an original one).  */
 698   unsigned reverse : 1;
 699
 700   /* The parameter is to be passed by reference.  */
 701   unsigned by_ref : 1;
 702 };
 703
 704 typedef vec<ipa_parm_adjustment> ipa_parm_adjustment_vec;
 705
 706 vec<tree> ipa_get_vector_of_formal_parms (tree fndecl);
 707 vec<tree> ipa_get_vector_of_formal_parm_types (tree fntype);
 708 void ipa_modify_formal_parameters (tree fndecl, ipa_parm_adjustment_vec);
 709 void ipa_modify_call_arguments (struct cgraph_edge *, gimple,
 710                                 ipa_parm_adjustment_vec);
 711 ipa_parm_adjustment_vec ipa_combine_adjustments (ipa_parm_adjustment_vec,
 712                                                  ipa_parm_adjustment_vec);
 713 void ipa_dump_param_adjustments (FILE *, ipa_parm_adjustment_vec, tree);
 714 void ipa_dump_agg_replacement_values (FILE *f,
 715                                       struct ipa_agg_replacement_value *av);
 716 void ipa_prop_write_jump_functions (void);
 717 void ipa_prop_read_jump_functions (void);
 718 void ipa_prop_write_all_agg_replacement (void);
 719 void ipa_prop_read_all_agg_replacement (void);
 720 void ipa_update_after_lto_read (void);
 721 int ipa_get_param_decl_index (struct ipa_node_params *, tree);
 722 tree ipa_value_from_jfunc (struct ipa_node_params *info,
 723                            struct ipa_jump_func *jfunc);
 724 unsigned int ipcp_transform_function (struct cgraph_node *node);
 725 void ipa_dump_param (FILE *, struct ipa_node_params *info, int i);
 726 bool ipa_modify_expr (tree *, bool, ipa_parm_adjustment_vec);
 727 ipa_parm_adjustment *ipa_get_adjustment_candidate (tree **, bool *,
 728                                                    ipa_parm_adjustment_vec,
 729                                                    bool);
 730
 731
 732 /* From tree-sra.c:  */
 733 tree build_ref_for_offset (location_t, tree, HOST_WIDE_INT, bool, tree,
 734                            gimple_stmt_iterator *, bool);
 735
 736 /* In ipa-cp.c  */
 737 void ipa_cp_c_finalize (void);
 738
 739 #endif /* IPA_PROP_H */